Improvement in rotary pumps



UNITED 'STATES PATENT Orrrcaf FRANCIS B. SCOTT, OF BUFFALO, NEW YORK.

iMPRovEMENT I'N ROTARY PUMPS.

Specitication forming part of Letters Patent No. 36,577, dated September 30,' 1362.

To all whom, it may concern: Y

Beit known that I, FRANCIS B. Soorr, of the city of Buffalo and State ofNew York, have invented certain new and useful Improvements in Rotary Pumps; and I do hereby de- Clare that the following is a full and exact deseription of the construction and operation thereof, reference being had to the accompanying drawings, making a part of this speciiication, in which- Figure I is a plan of rotary pumpv having a central discharge. Fig. II is a vertical. section of same. Fig. III is a plan ot' pump with side discharge; Figs. IV and IVf, details of the forcing-piston as connected to a hinged and radial arm. Figs. V and Vf represent a piston slightly ditferingin form from the other, showing a spring-packing connected therewith.

Letters of like name and kind refer to like parts in each of the figures.

A represents the case, which is made, of cast-iron or other suitable metal, in two parts, which parts are secured to each other by the bolts a and form the external shell or case. The suctionoritice is shown at B, and the discharge-orifice is shown at G. A cam is cast or placed upon the inside of one of these parts, as shown by the dotted lines I) in Fig. I, in which cam a friction-roller works, in order to give the valve or piston its required outward and inward movement to insureits proper action upon thewater. This friction-roller is connected to and projects from the piston, as shown at e.

F represents the valve or piston cylinder, which is fitted to work within the case and carry the pistons. Its diameter is less than that of the case, the difference being equal (or nearly so) to the throw or outward and inward movement of thepistons. The piston is hinged orjointed to the cylinder, as shown at g, so as to allow of an easy outward and inward movement. Slots or openings are made through the cylinder, as shown at h, through which the pistons move. These may be babbitted.7 An abutment is placed just forward of the discharge-orifice within the case and between the suction and discharge orifices, as shown at t' in Figs. I and III. Y

J represents the valve or piston, which has the form of an arc, and J the radial arm lwhich connects it to the cylinder F. It mayk be made with a plane square endas shown in Fig. IV, or with a rounded end, as shown in Fig. V. In either form the piston must eX- actly fit the water-space within the case.

The case may be packed in a common manner, and the piston may have a spring-packing, as shown at K, Figs. V and Va.

The piston and radial arm may be made in one casting, or'the piston may be made separate from the radial arm and connected thereto by a bolt, screw, or otherwise. In Fig. IV it is shown as connected to the radial arm by a set-screw, Z. A slot is made in the shank of the piston, as shown at m, Fig. IV, through which the screw passes and screws into the lug Vin the radial arm, as shown at n, Fig. IV. The object of this slot lis to make the piston adjustable, so that if it wears otf at the end by rubbing against the case it may be movedu p and made to t watertight against the case. The piston (as a modification) may also be made tapering,and the inside ofthe case made tapering to correspond, and then when it is moved up (after Wearing enough to get loose) it will insure a water-tight fit at the sides as well as at the end. Vhen made tapering, as described, nopacking will be required onthe piston.

The shaft P, which connects to and revolves the piston cylinder, is made hollow, `with openings p made through the sides, which open into and take water from the chamber s, so

that the shaft answers the double purpose of shaft and discharge-pipe. It connects with the short solid shaft p2, which has a bearing on the inside of the Case, as shown at p3.

A water-chamber is made in the case on the outside, as shown at s, which conducts the water from the water-space WV within the case to the discharge-milice or hollow shaft.

rIhe form of pump shown in Fig. III, with l side discharge, may be advantageously used mills, &e.

Operation: This pump being constructed substantially as described, power is applied through the crank R, or by steam, ina oommon manner. The frictionroller e, which is connected with each piston, moves in the cam' D and throws the pistons outwardly through the slots in the cylinder at the proper time to carry the Water forward to the discharge-pipe, the cam audfriction-roller also causing the pistons to draw back into the cylinder at the vice for giving form tothe tile needs only to be attached to the discharge-orifice of the case,wth the necessary apparatus for feeding.

What I'claim as myinvention, and desire to secure by Letters Patent, is r l. The arrangement of the piston-cylinder F, pistons J, and cam D, with the case A,sub stantially as herein set forth.

2. The hollow rotary shaft P, in combina- Vtion with the Water-chamber S, substantially as described.

FRANCIS B. SCOTT.

Witnesses:

E. B. FoRBUsH, W. H. FoRBUsH.

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